I had to look up the chrome lights. They look like the hydrogrow led new series. That's a new one that starled is putting out. The sales rep sent me their pdf promotion file. They say that the 80led version covers
"Regards as coverage ,shows on catalog.LS-Iris-80--8-13sqm,is tested by our professional engineer,precondition is hang the light above the plant 2-3meter,since this item is high power and super penetration for plants,very high cost performance than Traditional 3w."
Which is 9ft x 9ft. They're recommendations on the older lights seemed quite reasonable but that seems absurdly high coverage for 200 -220w